Bacteria and Homo Sapiens, a Tale of Oxygen and CO2

Homo sapiens’ ancestor tree goes back to about 4 billion years ago when our oldest relatives, bacteria, and archaea started their journey. These two, were hard at work for two billion years as tiny biochemists, developing myriads of metabolic tricks with organic compounds, laying the foundation for the workings of our cells. Even though they didn’t even have a nucleus in their cell, they already had…